They each give their controlling player one Lore at the start of their turn
3 Mew Ex Alternate Is Quite Mysterious A Docile Relaxing Mythical Pokmon The alternate artwork for Mew ex is so fantastic primarily due to how peaceful the scene feels upon viewing it
The other option costs two black mana, and allows a target player to draw three cards and lose three life
A permanent's level is based on how many level counters it has on it, not how many times its level up ability has been activated or has resolved
Ramping into Ulamog, the Ceaseless Hunger or Emrakul, the Promised End used to be quite potent against control strategies, and you can certainly imagine a world in which Field of the Dead alongside these threats pushes control decks out of the format in an unhealthy way
You can crack them for fun, use them in a draft pod, build a sealed deck, or just open a box to see what you pull